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About limewater test

  1. Apr 27, 2010 #1
    Carbon dioxide and sulphur dioxide both can turn limewater milky. Either the presence of carbon dioxide and sulphur dioxide can give a positive test result. Why limewater test can be a dedicated test for carbon dioxide?
  2. jcsd
  3. Apr 27, 2010 #2


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    It isn't. (But if you pass SO2 through it long enough, it will form CaS and become clear again, so in this particular case, it can be a test if you have enough gas.)
  4. Apr 27, 2010 #3
    If excess amount of carbon dioxide is bubbled into limewater, a clear solution can also be formed (calcium hydrogencarbonate formed). So, excess gas also cannot distinguish between sulphur dioxide and carbon dioxide. I wonder why we usually conclude that carbon dioxide is present if a positive result is shown in limewater test, ignore that it is the presence of sulphur dioxide leading to the positive result.
  5. Apr 29, 2010 #4


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    Not true. You will never make a bicarbonate of calcium. It just doesn't happen. ... as a solid anyway.
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